There were a lot of genre books during the 50's through 70's that were under 250 pages. That is because during that time period, the primary way of getting paid was to sell it as a serial in a magazine rather than as a stand alone novel. For example, if you look at Zelazny's Amber series, most of them first were serialized in a magazine. The vast majority of Michael Moorcock's Eternal Champion books (Erlic, Corum, Count Brass, etc..) were under 250.
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